With the development of smart grid, the integration of electrical devices has become the main trend. The construction of smart substation will meet the need of the development of smart grid. The application of the intelligent devices enables the interaction of information in real time, and it achieves the automation of the substation system. This paper introduces the pertinent technologies and applications of the intelligent micro substation, and there analyzes the requirements of the key technologies. There will be a discussion of the reliability, economy and social benefit of the intelligent substation which is based on the improvement of the existing traditional substation system structure. In this paper, the advantages of smart micro substation in the application of urban concentrated area are proved.